Signboard connector



FIG. 1 is a front perspective view of a signboard connector showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another front perspective view thereof in an alternate position of use.

The broken lines illustrate portions of the signboard connector that form no part of the claimed design. 

CLAIM The ornamental design for a signboard connector, as shown and described. 